Adjusting means for threading dies



July 16, 1929. G. M. MEHL ADJUSTING MEANS FOR THREADING DIES Filed April25, 1927 Patented July 16, 1929. I

GEOBGE II. MEHL, OF ERIE, PENNSYLVANIA, ASSIGNOR TO WILLIAMS PORATION,OF ERIE, PENNSYLVANIA.

maize TOOL GOR- ADJUSTING MEANS FOR THREADING DIES.

Application filed April 25, 1927. Serial No. 186,389.

My invention pertains to threading'dies for cutting threads on pipebolts, nipples, etc. and has particular reference to a means foradjusting such dies within their holders.

My invention is especially adaptable to the round or circular type ofdie which is rotatably adjustable within its holder.

The primary object of my invention is to provide a novel and simple formof die adjusting means to permit the ready andquick adjustment of agiven set of dies to adapt them for work upon varying sizes of pipe orother material to be threaded.

Another object is to provide such an adjusting means which serves as anindicator of the position of the die within the holder.

A still further object is to providean adjusting element which may beremoved from the die after use and thus lessen the likelihood ofaccidental displacement of the die after it has been set.

Other objects and advantages in details of construction and operationwill be apparent as the description proceeds, reference now being had tothe accompanying drawing Figure 1 is a side View of a die holder anddie, showing my improved adjusting means thereon.

Figure 2 isa front view of the same.

Figure 3 is a detail perspective view of a die in connection with whichmy adjusting means is used.

Figure l is a detail perspective of the adjusting element.

Reference numeral 1, indicates a die holder of the usual constructionand provided with an opening 2 adapted to receive the usual headed stud(not shown) which operates within the grooves in the usual cam plate,whereby the die holder may be ad justed radially within the head. Suchstructure is well known, and need not be here illustrated nor described.

The holder 1 is provided at its lower end with acircular opening 3adapted to receive the circular die 4;. The opening 8 extendssubstantially through the width of the holder and centrally of saidopening and extending from a point adjacent the inner end thereofoutwardly to the face of the holder is an are'uate shaped slot 5dividing dis held-sir jest shave die a clamping sections. A tighteningscrew 6 extends from one sidewall of the holder through the slot 4 andinto the opposite side of said holder. .This clamping screw 6 isprovided with a socket head 7 whereby a socket wrench may beinserted andupon the tightening of thescrew serve to clamp the die holder about thedie 4 thus holding it rigidly within the holder. :It will be observedthat the socket head 7 of the screw 6 lies either flush with or belowthe surface of the die holder.

Thedie L is provided in onesidewith a v recess 8 against theverticalwall of which engages a set screw 9 likewise provided with asocket head, and by means of which the die 4 may be given a very fineadjustment within the opening 3 within the holder, and which in additionserves to take the thrust of the die during the cutting operation.

It will be understood that when the screw 6 is loosened, the die 4 maybe rotated within the holder for adjustment to the various sizes of pipeto be threaded. This adjustment is provided in order to permit the useof a single set of dies for pipe varying widely in size. For instance,in one position of the die suflicient clearance will be provided forpipe of from 2 inches to 4 inches in diameter whereas for pipe from 4inches to 8 inches in diameter, greater clearance is necessary and thedie must be adjusted .to the leftin Figure 1 to permit such clearance.

Novel means have been provided for so adjusting the die and indicatingits adjusting position. I

A groove or recess 10 is cut in the outer end of the die 4 and openingto the periphery thereof. An adjusting member 11 has on its underside akeyway 12 adapted to fit within the groove 10. The adjusting member 11is provided. on top with. a finger piece 13 and at one end terminates ina pointer 14. A scale 15 may be marked or otherwise provided in the dieholder and over this scale the pointer 14 is adapted to move whenadjusting the die. It will be observed with reference to Figure 2 thatwhen the adjusting element 11 is positioned with-. in the groove 10 foradjusting the die, the pointer 14 lies flush over the surface of theholder and in close proximity thereto. The advantage of the elongatedpointer 14 will be (revises for the reason that adjust meet in slightthe dis 4% ery and directly in front of the teeth 16 the die is cut awayas at 17 to provide for the discharge and removal of the cuttings as thethreading operation progresses.

In the operation of my invention, the clamping screw 6 is loosened andthe die 4: slipped into the opening 3. The adjusting element 11 is nowinserted in the end of the die and the die rotated to No. 1 on thescale, if for instance pipe from 4 inches to Sinches in diameteris to bethreaded, or to No. 2 on the scale, if smaller sized pipe is to bethreaded. When the adjustment has been made, the set screw 6 istightened thereby rigidly clamping the die 4 on the holder. The setscrew 9 may be now adjusted until the point engages the die within therecess 8 so as to take the thrust thereof during the threadingoperation.

If it becomes necessary, due to wear, to sharpen or grind off thepointsof the cutting teeth 16, or due to slight variation in dies, theset screwl) may be untilized to provide a very fine adjustment to takecare of such. grinding or variation.

After the die has been adjusted in the holder by means of the adjustingelement 11, such element maybe removed and, the outer end of the diebeing flush with the side wall of the holder, there is little likelihoodof accidental displacement of the die.

Of course, many changes may be made in details of arrangement withoutdeparting from the spirit and scope of my invention.

I do not limit myself, therefore, to the exact.

structure shown and described, other than by the appended claims.

I claim 1. In combination, a die holder provided with a clampingportion, a circular threading die therein, means for rotatably adjustingsaid die, comprising a removable pointer said die and pointer havinginterengaging means whereby said die -1nay be adjusted by said pointer,and a scale over which said pointer moves when in adjusting position. I

2. In combination, a die holder provided with a clamping portion, acircular threading die therein, means for rotatably adjusting said diecomprising a recess in'one end of said die, a removable pointer having akey engageable in said recess for rotating said die, and a scale on saidholder substantially spaced from said die, over which said pointer movesto indicate the position of said die.

3. In combination, a die holder provided with a clamping portion, acircular threading die therein, means for rotatably adj'usting said diecomprising a recess in one end of said die, a removable pointer having akey engageable in said recess for rotating said die, and a scale on saidholder substantially spaced from said die, ofver which said pointermoves to indicate the position of said die, said pointer lying flushwith the surface of said holder when .in die adjusting position.

GEORGE M. MEHL.

